Calibre How To copy from Disc

Hi,

Newbie to the forum and to Calibre. I have several discs of Kindle books on discs, I've downloaded Calibre all good. But I'm trying to copy entire folders to it and without luck, maybe it can't be done ?

i.e. A single folder on the disc may contain 100 books, surely I don't have to open every single book to then subsequently add to Calibre ?

I'm going to be here all night and some if that's the case :(